---
title: AttributedTextFormattingDefinition.ValueConstraint
framework: swiftui
role: symbol
role_heading: Type Alias
path: swiftui/attributedtextformattingdefinition/valueconstraint
---

# AttributedTextFormattingDefinition.ValueConstraint

A text formatting definition that permits a single attribute to be used, optionally constrained to a set of values.

## Declaration

```swift
typealias ValueConstraint = AttributedTextFormatting.ValueConstraint
```